To be honest the recommendation of Lock On is a but obtuse. Indeed there is camera and school life however the feelings of the two are completely different. Not to mention that Lock On was cancelled before it got going.
The story is pretty well done for being only 20 chapters and you feel for the main male character right from the get go as it seamlessly pulls you in. If you have the time you should definitly knock this one out \(^_^)/
It's really hard to describe this by comparing it to another manga I have read simply because it more like a combination of a munch of different elements.
Childhood Friend that live next door to each other. The guy has confession issues. He can see the future through his camera and he is not attached to his love. Add in the older guy and a semi traumatic past and a semi selfish girl and you get a story.